I agree about the difference in contrast that @Joe mentioned. That’s easily fixed by adjusting the contrast of the bag.
However, other problems can’t be easily fixed. The bag is black, which hides much of the detail. More problematic is that from the head-on angle, the bag is just a rectangle with no visual depth to indicate that it’s a three-dimensional bag that’s attached to the bike.
I think the best option is to shoot a photo of the bag from an angle while it’s actually attached to the bike.